I just downloaded the latest issue LXF 175 from the subscription area and tried opening it in okular and evince only to find that none of the text will render. I can load old versions of the magazine (LXF 174 & LXF 173 tested) without any problems. If I load LXF 175 in Adobe Acrobat reader 9 I can read it, but it's slow and bloated.

Has the font changed?
I'm running debian 7, is it missing a font which I should install to read the new magazines?